Spatio-temporal variation of the phytoplankton community in a tropical estuarine gradient, under the influence of river damming

Conceição, Lorena Pedreira; Affe, Helen Michelle de Jesus; Silva, Daniela Mariano Lopes da; Nunes, José Marcos de Castro

doi:10.1016/j.rsma.2021.101642

Cited by 9 publications

(10 citation statements)

References 44 publications

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“…The genus Navicula is included in the motile guild and is considered an adapted genus to turbulence and variations in nutrient concentrations (Passy, 2007). Previous studies corroborate our results, demonstrating that diatoms are representative contributors to taxonomic richness and abundance in the phytoplankton community (Bolgovics et al, 2017;Conceição et al 2021) of ultraoligo-to mesotrophic, and agricultural or urban rivers, with low flow and distinct nutrient concentrations (Passy, 2007;Simić et al, 2015).…”

Section: Discussionsupporting

confidence: 85%

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

et al. 2022

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Aim Urbanization, agriculture, and deforestation are the main anthropogenic factors that modify the soil, altering the quality of water, and influencing limnological aspects and the aquatic biota in rivers. We investigated the morphology-based taxonomic and functional response (MBFG) of the phytoplankton community among different public supply rivers in distinct hydrographic basins with ultraoligotrophic, oligotrophic, and mesotrophic characteristics. Methods We sampled the phytoplankton community and environmental variables in nine rivers along three hydrographic basins in western Paraná. In order to evaluate the taxonomic and functional relationship of the community with the environmental variables, we applied both variance and redundancy analyses. Results Differences in temperature, pH, turbidity, total phosphorus, chemical oxygen demand, and total dissolved solids were identified among river basins and/or trophic states. The highest taxonomic contributions to richness and biovolume were from green algae and diatoms, while the highest functional contributions were from MBFG IV (algae without specialized traits), MBFG V (unicellular flagellated algae), MBFG VI (algae with a siliceous exoskeleton) and MBFG (large colonial algae). The taxonomic approach was sensitive to environmental variability in the rivers, while for the functional approach no relationship to environmental variability was identified. Conclusions The taxonomic approach of the phytoplankton community was more sensitive to the environmental variability of the studied rivers than the functional approach based on morphology. Therefore, we reinforce the importance of biological indicators for understanding the dynamics in aquatic ecosystems, providing crucial information for the management of water resources used for public supply.

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Section: Discussionsupporting

confidence: 85%

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

et al. 2022

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“…Changes in freshwater flow by dams affect the estuary salinity, resulting in changes in salinity-sensitive marine organisms [106][107][108]. For instance, the low estuary salinity caused by the Fitzroy Barrage could reduce estuarine jellyfish populations because jellyfish cannot survive at low salinities [109].…”

Section: Effects Of Dam Construction On Ecosystems Of the Estuary And...mentioning

confidence: 99%

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

et al. 2022

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Dams have made great contributions to human society, facilitating flood control, power generation, shipping, agriculture, and industry. However, the construction of dams greatly impacts downstream ecological environments and nearby marine areas. The present manuscript presents a comprehensive review of the influence of human activities on the environment, especially the effect of dam construction on the ecosystems of river estuaries and nearby marine areas, so as to provide a scientific basis for ecological environment protection. To summarize these impacts, this review used recent studies to comprehensively analyze how dam construction has affected river hydrology, geomorphology, and downstream ecosystems globally. Effects of dams on ecosystems occur through reduced river flow, reduced sediment flux, altered water temperature, changed estuary delta, altered composition and distribution of nutrients, altered structure and distribution of phytoplankton populations, habitat fragmentation, and blocked migration routes in river sections and adjacent seas. Effects of dam construction (especially the Three Gorges Dam) on the Yangtze River were also reviewed. Performing community and mitigation planning before dam construction, exploring new reservoir management strategies (including targeted control of dam storage and flushing sediment operations), banning fishing activities, and removing unnecessary dams (obsolete or small dams) are becoming crucial tools for ecosystem restoration.

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“…[ [31][32][33][34][35] Nutrient ratios Could reduce the silicon: nitrogen ratios sharply from 6.23 to 0.74. [15,36] phytoplankton community…”

Section: Characteristicsmentioning

confidence: 99%

“…Unlike other essential nutrients, silicon (Si) does not have downstream sources and is not resupplied to rivers after interception by dams [31,32]. Due to the effect of anthropogenic perturbations (mainly dam construction), the amounts of nitrogen (N) and phosphorus (P) have increased by 6.7 and 6.5 times, respectively, while the amount of silicon has decreased by 30% [15,30,58].…”

Section: Effects Of Dam Construction On Nutrient Flux To the Seamentioning

confidence: 99%

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Zhang¹,

Fang²,

Wang³

et al. 2022

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Dams have made great contributions to human society, facilitating flood control, power generation, shipping, agriculture and industry. However, the construction of dams greatly impacts downstream ecological environments and nearby marine areas. To summarize these impacts, this review used recent research to comprehensively analyze how dam construction has affected river hydrology, geomorphology, and ecosystem of downstream reaches globally. Effects of dams on ecosystems occur through reduced river flow, reduced sediment flux, altered water temperature, changed estuary delta, altered composition and distribution of nutrients, altered structure and distribution of phytoplankton populations, caused habitat fragmentation, and blocked migration routes in river sections and adjacent seas. Besides, exploring new reservoir management strategies (including targeted control of dam storage and flushing sediment operations), banning fishing activities, and removing unnecessary dams (obsolete or small dams) are becoming crucial tools for ecosystem restoration.

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Spatio-temporal variation of the phytoplankton community in a tropical estuarine gradient, under the influence of river damming

Cited by 9 publications

References 44 publications

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

Taxonomic and morphofunctional phytoplankton response to environmental variability in rivers from different hydrographic basins in Southern Brazil

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

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